The attack comes amid the sixth round of talks between the U.S. and the Taliban in Qatar, which aim to bring an end to the 18 year war. Taliban spokesperson Zabihullah Mujahid called the group a US network involved in "harmful Western activities" in Afghanistan.

Last week, the Taliban turned down a ceasefire agreement proposed by President Ashraf Ghani and Zalmay Khalilzad, the U.S. special envoy for peace in the country.

Johan Bass, U.S. ambassador in Afghanistan, strongly condemned the attack on the NGO.

The Taliban said they would continue their attacks during Ramadan, but would be "very careful of civilians during any operation".

Taliban spokesperson Mujahid said the aid group worked closely with government departments promoting women, an effort opposed by the hard-line Islamist group.

The explosion comes as the USA and Taliban representatives continue negotiations in Qatar aimed at bringing an end to the Afghan conflict.

Just over two weeks ago, gunmen targeted the Communications Ministry in Kabul, killing at least seven people in an attack claimed by the Islamic State in Iraq and Syria (ISIS).

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